Spentalkux

The description simply read '🐍📦'.

This (or just googling the challenge name) leads us to the Python Package site PyPi, which had Spentalkux 13.37.

I installed and ran this, and received this message:

My creator left this behind but, I wonder what the key is? I don't know, but if I did I would say it's about 10 characters. Enjoy this. Ztpyh, Iq iir'jt vrtdtxa qzxw lhu'go gxfpkrw tz pckv bc ybtevy...*ffiieyano*. New cikm sekab gu xux cskfiwckr bs zfyo si lgmpd://zupltfvg.czw/lxo/QGvM0sa6

The reference to a key of a given length made me think of Vigenère cipher. I pasted the message into dcode.frarrow-up-right and set the known keylength to 10. Hello, If you're reading this you've managed to find my little... interface. The next stage of the challenge is over at https://pastebin.com/raw/BCiT0sp6arrow-up-right (key: SPENTALKUX)

This contained hex data, which gave us raw PNG data when decoded.

The png contained binary numbers translating to '_herring', and a message to look back in the past.

I checked the version history of Spentalkux, and found and installed 0.9. This returned the message

JA2HGSKBJI4DSZ2WGRAS6KZRLJKVEYKFJFAWSOCTNNTFCKZRF5HTGZRXJV2EKQTGJVTXUOLSIMXWI2KYNVEUCNLIKN5HK3RTJBHGIQTCM5RHIVSQGJ3C6MRLJRXXOTJYGM3XORSIJN4FUYTNIU4XAULGONGE6YLJJRAUYODLOZEWWNCNIJWWCMJXOVTEQULCJFFEGWDPK5HFUWSLI5IFOQRVKFWGU5SYJF2VQT3NNUYFGZ2MNF4EU5ZYJBJEGOCUMJWXUN3YGVSUS43QPFYGCWSIKNLWE2RYMNAWQZDKNRUTEV2VNNJDC43WGJSFU3LXLBUFU3CENZEWGQ3MGBDXS4SGLA3GMS3LIJCUEVCCONYSWOLVLEZEKY3VM4ZFEZRQPB2GCSTMJZSFSSTVPBVFAOLLMNSDCTCPK4XWMUKYORRDC43EGNTFGVCHLBDFI6BTKVVGMR2GPA3HKSSHNJSUSQKBIE

After a long process of trial and error, I solved it. To save you some pain, here's a Cyberchef link: [Here](https://gchq.github.io/CyberChef/#recipe=From_Base32('A-Z2-7%3D',true)From_Base64('A-Za-z0-9%2B/%3D',true)Gunzip()From_Binary('Space')From_Binary('Space')From_Hex('Auto')From_Base85('!-u')&input=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-up-right)

ractf{My5t3r10u5_1nt3rf4c3?}

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